A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The plants had yellow seeds and pink flowers.

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Solution

Q.
A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The $F_{1}$ plants had yellow seeds and pink flowers. The $F_{1}$ plants were selfed to get $F_{2}$ progeny. Assuming independent assortment of the two characters, how many phenotypic categories are expected for these characters in the $F_{2}$ generation [2023]

1 9

2 16

3 4

4 6

Ans.
(4)

When the plant homozygous for yellow seeds and red flowers (YYRR) was crossed with a plant homozygous for green seeds and white flowers (yyrr), $F_{1}$ plants produced with yellow seeds and pink flowers. This means inheritance of seed colour shows complete dominance while inheritance of flower colour shows incomplete dominance due to blending of two alleles. This can be shown as follows:

Phenotypic Yellow seed : Yellow : Yellow : Green : Green : Green

Ratio Red flower Pink White Red Pink White

3 : 6 : 3 : 1 : 2 : 1

Therefore, six phenotypic categories are obtained in the $F_{2}$ generation.

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